Stages change if you edit sleep time...

[j30]

I have the charge 2 hr, which has the sleep stage pattern. I think this feature is really nice but I question it's accuracy.

Often times my fitbit will register that I was in a "light sleep" stage when I am relaxing before bed (reading, watching TV, etc...). I am sure this has happened to everyone at some point, it happened with the old sleep tracking as well.

When this occurs, in the morning when I check my sleep graph, I will often edit my sleep start time to reflect the (around) the actual time I went to sleep. Often times when I do this, my sleep stages change. For example a portion of my graph that was in "light sleep" could become "REM sleep" or "deep sleep"; if I change the start time again, it will again change.

I reckon when you edit your sleep times, the Fitbit software is re-evaluating the sleep "block" and then making best guesses as to what stage you were in at either time, so each edit is a new opportunity for the Fitbit software to make those guesses.

What I don't understand is that if my sleep start time was 11:30pm or 12:13 am, why it would think I was in light sleep vs rem or vice versa at one given point in time...

It seems like the stages are more guesstimates than people are assuming.

PS - the new "awake" metric is pretty poor in my experience. A lot of us are now getting absurd "awake" times compared to the old sleep tracking system (even with sensitivity set properly)

EDIT: I wanted to include some screenshots. While this isn't the best example of what I am describing it shows what I mean.

Sleep stages before edit (note time frame)Sleep stages after edit (not new deep sleep stage)

[j30]

UPDATE:

My tracker is now tracking time in the middle of night when I am sleeping (likely REM) as awake. These aren't short bouts of awake time (< few mins) but 15min+. I don't sleep walk or anything similar so I am unsure why I am getting these poor readings.

I really think there are some serious flaws with the stage tracks; the option to revert back to the "old" sleep system or ability to change a stage would be a nice option in the interim.

[WavyDavey]

@j30,

As a workaround, if you turn Heart Rate to OFF before sleep in the settings, it will force it to use the old sleep model.

[TrishYo]

I have the same concern but no answers. 😴

[AbigailMarie]

I think the new deep sleep stage is because in 8 hours of sleep 6 minutes of deep and 40 minutes of light makes a smaller impact than 6 minutes in a 46 minutes time ftam for 3 hours of sleep. Like 6/460 versus 6/180